111987 has 12 divisors (see below), whose sum is σ = 169104. Its totient is φ = 71280.

The previous prime is 111977. The next prime is 111997. The reversal of 111987 is 789111.

It is an interprime number because it is at equal distance from previous prime (111977) and next prime (111997).

It is not a de Polignac number, because 111987 - 2⁸ = 111731 is a prime.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 111987.

It is not an unprimeable number, because it can be changed into a prime (111977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64 + ... + 477.

It is an arithmetic number, because the mean of its divisors is an integer number (14092).

2¹¹¹⁹⁸⁷ is an apocalyptic number.

111987 is a deficient number, since it is larger than the sum of its proper divisors (57117).

111987 is a wasteful number, since it uses less digits than its factorization.

111987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570 (or 567 counting only the distinct ones).

The product of its digits is 504, while the sum is 27.

The square root of 111987 is about 334.6445875851. The cubic root of 111987 is about 48.2009802203.

The spelling of 111987 in words is "one hundred eleven thousand, nine hundred eighty-seven".